Snowplow



` /f' l @We UAM@ Dec, so, 1930. G. c. ABBE 1,786,974

sNowPLow I f FiledJuly 1e, 19g@ z'sheets-s'heet 1 j f Ou 3 o .2,

Dec. 30, E936.- G. c. ABBE 1,786,974.

SNOWPLOW .filed July 16,1926 2 Sheets-Sheet 2 7n 5 8 0 )o v A In" f v,W70/Mfrs.

Patented nee. eo, 193e suenen lc. neen, 4or',naivivn'ra" sen E,EENNSYLVANIA, ASSIGNGR TO AMERICAN ROAD MAIERY COMPANY, ZINC., F KENNETTSQUARE, PENNSYLVANIA, A. COR- p Yronaaroiv on nnnawalnn Application ledJuly 16,'

My` invention relates to improvement in snow plows and is moreparticularly lapplicable to plows of the blade type adapted to besecured to and propelled by a motor truck.

' d. Plows of .the type to which my invention pertains are usuallysecured to a truck through the medium of a frame pivoted on a transverseaxis to a bracket secured to the axle of the truck. The blade or plowproper l@ is pivotally secured on a transverse axis to a semiring, whichis in turn carried by the frame. rlhe blade is held in working positionon its transverse axis by means of a p heavy spring, which permits it totilt and pass over obstructions, which may be encount-v ered, and alsoacts to return it to working position against a lined stop, the positionof which may be adjusted. ln such plows the iframe which supports thesemiring is adapted 2@ to be raised, about its pivoted connection with"at relatively high speed thus enabling a relatively great distance to'beplowed in a minimum of time. However, such plows have been found to be.open to a number of objections which result chiefly from the erigenciesof the service to which the plows are subjected. y l y For example,when'the blade strikes an obstruction, itis permitted to tilt againstthe action of Aa'heavy spring, which when the obstruction is clearedforces the blade back into working position against a xed stop. linorder that the` blade may be eiicient, the spring used is very heavy andsubstantial damage to the plow frequently occurs from the springs sharpaction in returning the blade to working position.

Further, the lifting device and connections' 53 areso arranged that theconnections are nec- 1926. Serial. No.; 122,753.

essarily slack when the plow is in operation, ,j

and the connections afford no support to the plow, in operation. lf theroad'surface be uneven the plow will be heavily jarred, since therollers will tend to bump over the sur- .face rather than follow it, andwhen it is sought to raise the plgw-,substantial time is consumed intaking out the slack in the connections. t

y Further, while in the present plows means are dprovided for spacingthe lower .edge of the lade 'from the road surface, such means lareineicient since they have no capacity for adjustment enabling adjustmentof the plow, or for compensating forwear.

New it is an object of my invention to provide a plow which will havethe requisite capacity t0 tiltand at the same time will be provided witha stop which will avoid damage to the plow on the returnto workingposition of the blade.

A further object of my invention is to provide connections between ahoisting device and the plow which will not only permit of the plowlbeing raised more rapidly, but

which will prevent to a substantial extent,

jarring -offthe plow on uneven road. surfaces.

A still further object of my invention is to provide improved means forspacing the lower edge of the blade from the road surface., which may bereadily adjusted'to efect a desired spacing of the blade or tocompensate or wear.

Having now indicated, in a. general way, the 'nature and purpose of myinvention, l willproceed to a detailed description thereof withreference to the accompanying draw-v ings 'in which there has beenillustrated aV preferred embodiment and in which Fig. l, isa snow plowembodying my in vention.

Fig. 2, isa'side view of the major portion Aci the plow shown in Fig.Il.

Fig. 3.

ig. 5, is a plan view of ap portion of the subject ot-Fig. d.

Fig. 6, is a view partly in section, a modification of the subject ofFig. 3. v

Referring more particularly to Figures 1-3, a, a indicate bracketsadapted to be clamped to the front axle 1.00 of a Vmotor truck, thebrackets are connnected by a bar b and carry clevises c. The ends of anAframed are pivotally secured to the clevises c by means of transverselyextending pins e.

The blade f is attached to the forward end of the A frame in the usualmanner, by means of a block and vertical and horizontal pivot pins, notshown, so as to be swingable on both a vertical and a horizontal axis.

A semiring g is secured at its ends to blade f by means of horizontallyextending pins h, in alignment with the horizontal pin affordingconnection between the A frame and,

blade. The semiring is provided with holes z' adapted for the passage ofa pin j extending through a bracket 71 mounted in the A frame, whichoverlies the rin As is apparent, the blade may be adjusted at an angleand the pins j passing through the bracket k and through one of theholes z', in the semiring,

serves to hold the blade in adjusted position.`

Extending across the semiring between its ends is a bar Z which servesto brace the semiring and also to supporta bracket m through whichextends a rod 1t, the forward end of which is secured to a block 0inturn secured to a bracket p pivotally secured to the blade midwayitsends and near its up er edge, by means of a horizontally exten ingpm.

Therear end of rod 11 is threaded for the reception of a nut, which witha washer g serves to confine a heavy coil spring 1' on the rod behindthe bracket m. A lighter coil spring s positioned on the shaft infrontof bracket m is confined between the bracket and the block o to whichthe forward. end of the -rod 11J is secured.

From theabove description, it will be observed that the blade isretainedin a working compresses the spring 1", which when the obstruction is,passed, forces the blade back to working position, which as will Abeobserved in accordance with my invention, is governed v by the spring-swhich acts as a bufer to stop the blade yieldingly. The spring s alsomay permit the blade in returning to working position to tilt forwardslightly and then act to return it, so that all jarand shock .is

of the bla e from the road surface.

removed from the blade and its supporting structure.

` Beneath the ends of the semiring and acting to support the forward endof the A frame are castors or rollers t each mounted in the lower end ofa stem u which extends into the lower endof a casing o, secured to thesemiring. The upper portion u of the stem u is reduced in size, forminga shoulder 'w' and extends through the casing. Within the casing andencircling the portion u of the stem u 'is a coil spring which isconfined between shoulder lw and abutment y extending into the upper endof the casing and secured thereto by bolts .e and nuts 2. The portion uof the stem passes through the abutment and is provided at its upper endwith a stop ,3, all as shown in detail in Figure 3.

As will now be observed, Lthe'rollers ,t act to support the forward endof the frame and the semirin and also .to space the lower ergge erollers t may be adjusted to effect a desired spacing of `the blade fromthe road surface by varying the degree of penetration of the abutment g/into the casing fv which'may be readily accomplished by an adjustment ofthe nuts on the bolts z. j

In Figures 4 6 I have illustrated a modification of means for supportingthe A frame and spacing the plow from the road surface. The castors' orrollers t" are each mounted in the lower end of a stem 4 which projectsinto a casing 5 and the upper end of which is made hollow for thereception of a coilv spring 9 vwhich 'is confined between the stem andthe upper end of the casing, as shown in Figure 6. A spring guide 6 issecured to the stem by a pin 7 and extends through the top of thecasing. j A nut 8 threaded on the upper end of the guide 6 outside ofthe casing and engaging the top thereof, acts as a stop and enablesadjustment of the stress of spring 5. The casing 5 is secured to thesemiring g through a fitting 9. Brackets 10 are secured to the ends ofthe semiring and are provided at vthe forward ends with holes for thepassage' of vpins/11 which are adapted also to pass through any one of aseries of holes 12, ar.-

ranged o'ne above fthe other, in brackets 13 secured to the blade f,thus afordinga connection between the semiring and the blade.

As will now be obvious, the desired spacingv of the blade from theground may be obtained by passing the pins 11 through oneor Yanother ofthe holes 12 in brackets 13.

Referringnow to Figure 2, the plow in accordance with my invention, isprovided with a conventional hoisting device 1.02 to enable the forwardend of the A frame to .be lifted about its pivotal connection with thetruck in order to raise the blade. The hoisting device j lll) I andforming a stop for the lower end of the spring. The clamp confines thespring between itself and the hook 15.

As will now be obvious, the hoisting device is connected to the semiringthrough a spring under initial stress. thus when the plow is to behoisted no time is lost in compressing the spring and while the plow isin operation, the chains to the `hoisting devicel are kept taut withoutaffecting the position of the plow through jarring, since the springs 16will absorb any jar.

lVhen in the claims hereto appended I refer to a motor truck, I intendto include a tractor or other suitable source 0f power.

Having now fully described lny invention. what I claim and desire toprotect by Letters Patent is 1. In a snow plow. a frame. means forpivotally connecting the frame to a vehicle, a blade pivotally supportedfrom the frame on a transverse axis, a pair of springs carried by theblade, abutments therefor carried by the blade. a common abutment forsaid springs carried by the frame between the abutments carried by theblade, said springs being arranged in opposition 'and adaptedrespectively to swing the blade on its axis and yieldinglyresistswinging of the blade.

2. A snow plow arranged to be pivotally attached to a vehicle having aframe, a blade spring.

5. A snow plow structure comprism g a support, a plow assembly pivotallysecured to the support, means carried by the support for lifting theplow assembly, and a spring connected between said means and said plowassembly, said spring being normally under an initial compreion aboutequal to the component of the weight of the plow assembly acting thereonto compress the same.

6. A snow plow structure comprising a support, a plow assembly pivotallysecured to the support, means carried by the support for lifting theplow assembly, a spring connected between said means and said plowassembly. said spring being normally under an initial compression aboutequal to the component of the weight of the plow assembly acting thereonto compress the same, and means for adj usting the initial compressionofthe spring.

7. ,A snow plow structure including a supporting frame, a bladepivotally supported from the frame on a transverse axis, a pair ofopposed springs carried by the blade, abutments therefor carried by theblade, and means located between the abutments and carried by the framefor fixing the positions of the adjacent ends of the springs, saidsprings being arranged respectively to swing the blade on its Aaxis andyieldingly resist swinging of the blade.

In testimony of which invention, I have hereunto set my hand, atPhiladelphia, Pennsylvania, on this 1st day of July, 1926. GEORGE C.ABBE.

pivotally connect-ed to the frame on a transverse axis intermediate theupper and lower edges of the blade. arod pivotally connected to theupper portion of the blade, a spring abutment on the frame through whichthe rod j extends, an abutment on the rod on each side of the abutmenton the frame, and a spring on the rod between each abutment on therodand the abutment on the frame.

3. A snow plow structure comprising a support. a plow assembly pivotallysecured to the support. means carried by the support for lifting theplow assembly, and a spring connected between said means and said plowassembly, said spring being normally under an initial stress about equalto the component of the weight of the plow assembly to be lifted.

4. A snow plow structure comprising a support, a plow assembly pivotallysecured to the support. means carried by the. 'support for lifting theplow assembly, a spring connected between said means and said plowassembly, said spring being normally under an initial stress about equalto the component of the weight of the plow assembly to be lifted, and

